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Ubuntu CH341串口配置问题

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一、前言

初次接触飞腾开发板，我的 ubuntu 系统无法正常使用 USB 串口线连接开发板，问题集中在 CH341 的驱动上面。

二、问题及解决办法

1. 驱动冲突

物理线路正确连接后，查询 ttyUSB 设备信息，连接后立即 disconnected。

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lg@ubuntu:~$ sudo dmesg | grep ttyUSB
[12946.029195] usb 1-2.1: ch341-uart converter now attached to ttyUSB0
[12946.576807] ch341-uart ttyUSB0: ch341-uart converter now disconnected from ttyUSB0

多次尝试后又得到如下报错信息：

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lg@ubuntu:~$ sudo dmesg | grep ch341
[   38.193329] usbcore: registered new interface driver ch341
[   38.193360] usbserial: USB Serial support registered for ch341-uart
[   38.193393] ch341 1-2.1:1.0: ch341-uart converter detected
[   38.206613] usb 1-2.1: ch341-uart converter now attached to ttyUSB0
[   38.758581] usb 1-2.1: usbfs: interface 0 claimed by ch341 while 'brltty' sets config #1
[   38.761742] ch341-uart ttyUSB0: ch341-uart converter now disconnected from ttyUSB0
[   38.761800] ch341 1-2.1:1.0: device disconnected

发现是 brltty 服务占用了设备接口。

卸载 brltty 即可：

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sudo apt remove brltty
2. 驱动不适配

brltty 的冲突解决后，ls /dev 即可（应该?）看见 ttyCH341USB0 设备，但无法成功连接/连接不稳定，甚至无法识别。

原因是驱动与内核版本不适配。先卸载 ch341 驱动。

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sudo rmmod ch341

然后按该帖步骤正确安装驱动：

Ubuntu系统上ttyUSB被挂载为ttyCH341USB_ubuntu ch341-CSDN博客

如遇到签名无效则参考下帖：

https://blog.csdn.net/qq_28680277/article/details/129162559

然后重新接入开发板，即可识别。

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